Chancewu's Singular particles

分享个搞怪的Rap...其实也不"怪"

国内有九维空间兄的<退相干><爱在量子力学前>国外的也有不少哈 这不咱最近听到了首关于Dark Matter的Rap抓过来共享下

歌词如下：

The Dark Matter Rap: Cosmological History for the MTV Generation

My name is Fritz Zwicky,
I can be kind of prickly,
This song had better start
by giving me priority.
Whatever anybody says,
I said in 1933.
Observe the Coma cluster,
the redshifts of the galaxies
imply some big velocities.
They're moving so fast,
there must be missing mass!
Dark matter.

Dark matter: Do we need it? What is it? Where is it? How much?
Do we need it? Do we need it? Do we need it? Do we need it?

For nearly forty years,
the dark matter problems sits.
Nobody gets worried 'cause, "It's only crazy Fritz."
The next step's not 'til the early 1970s,
Ostriker and Peebles,
dynamics of the galaxies,
cold disk instabilities.
They say: "If the mass, were sitting in the stars,
all those pretty spirals, ought to be bars!
Self-gravitating disks? Uh-uh, oh no.
What those spirals need is a massive halo.
And hey, look over here, check out these observations,
Vera Rubin's optical curves of rotation,
they can provide our needed confirmation:
Those curves aren't falling, they're FLAT!
Dark matter's where it's AT!

Dark matter: Do we need it? What is it? Where is it? How much?
What is it? What is it? What is it? What is it?

And so the call goes out for the dark matter candidates:
black holes, snowballs, gas clouds, low mass stars, or planets.
But we quickly hit a snag because galaxy formation
requires too much structure in the background radiation
if there's only baryons and adiabatic fluctuations.
The Russians have an answer: "We can solve the impasse.
Lyubimov has shown that the neutrino has mass."
Zel'dovich cries, "Pancakes! The dark matter's HOT."
Carlos Frenk, Simon White, Marc Davis say, "NOT!
Quasars are old, and the pancakes must be young.
Forming from the top down it can't be done."
So neutrinos hit the skids, and the picture's looking black.
But California laid-back, Blumenthal & Primack
say, "Don't have a heart attack.
There's lots of other particles.
Just read the physics articles.
Take this pretty theory that's called supersymmetry.
What better for dark matter than the L-S-P?
The mass comes in at a ~ keV,
and that's not hot, that's warm."
Jim Peebles says, "Warm? Don't be half-hearted.
Let's continue the trend that we have started.
I'll stake out a position that's bold:
dark matter's not hot, not warm, but COLD."
Well cold dark matter causes overnight sensations:
hand-waving calculations,
computer simulations,
detailed computations of the background fluctuations.
Results are good, and the prospects look bright.
Here's a theory that works! Well, maybe not quite.

Dark matter: Do we need it? What is it? Where is it? How much?
Where is it? How much? Where is it? How much?

We have another puzzle that goes back to Robert Dicke.
Finding a solution has proven kind of tricky.
The CMB's so smooth, it's as if there'd been a compact
between parts of the universe that aren't in causal contact.
Alan Guth says, "Inflation,
will be our salvation,
give smoothness of the universe a causal explanation,
and even make the galaxies from quantum fluctuations!
There is one prediction, from which it's hard to run.
If inflation is correct, then Omega should be one."
Observers say, "Stop, no, sorry, won't do.
Look at these clusters, Omega's point 2."
The theorists respond, "We have an explanation.
The secret lies in biased galaxy formation.
We're not short of critical mass density.
Just some regions, are missing luminosity."
Observers roll their eyes, and they start to get annoyed,
But the theorists reply, "There's dark matter in the voids."

Dark matter: Do we need it? What is it? Where is it? How much?
Do we need it? Do we need it? Do we need it? Do we need it?

Along comes Moti Milgrom,
who's here to tell us all:
"This dark matter claptrap
has got you on the wrong track.
You're all too mired in conventionality,
wedded to your standard theory of gravity,
seduced by the elegance of General Relativity.
Just change your force law, that's the key.
Give me one free parameter, and I'll explain it all."
"Not so," claim Lake, and Spergel, et al.,
"On dwarf galaxies, your theory does fall."
The argument degenerates; it's soon a barroom brawl.

Dark matter: Do we need it? What is it? Where is it? How much?
What is it? What is it? What is it? What is it?

New observations hit the theory like an ice cold shower.
They show that cold dark matter has too little large scale power.
Says Peebles: "Cold dark matter? My feeblest innovation.
An overly aesthetic, theoretical abberation.
Our theories must have firmer empirical foundation.
Shed all this extra baggage, including the carry-ons.
Use particles we know, i.e., the baryons.
Others aren't convinced, and a few propose a mixture
of matter hot and cold, perhaps with strings or texture.
But nowadays most physicists are captured by the synergy
of inflation, cold dark matter, and repulsive dark energy.
Lambda or quintessence makes the whole picture integrate
by causing the expansion of the universe to accelerate.
New physics is exciting, and it gives us more to do.
Before we had one mystery. Now we have two.

So now you've heard my lecture, and it's time to end the session
with the standard closing line: Thank you, any questions?

Mp3看这里：http://www.symmetrymagazine.org/files/200702/darkmatterrap.mp3

大学最后一个学期的最后两个月了

恩...基本上进入尾声了...一个结束不过代表的是一个新的开始。最近发现有很多人检索我的那个量子力学的“指南”进来，说起来很惭愧，那是半成品的产物，当时没有好好再学的深入下要不面试不会“死”的那么惨...所以决定从新写下吧。

帖子的主题就是物理的四大力学，我是希望可以写出些连通的部分纯描述的话看书就好了，自然我也没有必要写哈~那样的话我写书单更方便不过既然有Fang的书单自然也没必要了...

大概每天中午写写吧，先从经典力学开始然后是电动力学，量子力学...统计物理的我不想写太多（估计很少~）广义相对论咱是基本没学（最近自学了一点点...）写不了...差不多就这么多吧，

形式是主要考码字...如果实在需要的话稍微写两个Tex的语句（再学所以不可能太复杂的~呵呵）

但是请不能要求太高（我能力有限，我知道经常有牛人漂过我的Blog~），其实主要的目的是为了缕下我的思路而已，当然写出来就是给别人看的所以如果您看到有什么问题的欢迎留言，但是介于我的Blog已经自制（我是独裁者，其实是讨厌乱说话的）所以如果看到什么不对的，不妥的，错误的欢迎和我讨论，请发送邮件到firebolt2015@163.com （不过就是没有什么讨论奖励了）

p.s抱个歉...最近没啥时间...做毕业设计的郁闷了 本来以为已经可以了结果去aps（PRA上07年的paper）上查了下 有雷同的 = =+ 哎...虽然APS上的比较牛都但是为了避嫌我还是换个玩吧...哎

这个需要推后一下了...